Critical Vulnerability in Linux Kernel: Missing Checks in virtio_net_hdr_to_skb Functionality
Summary
CVE-2024-43817: In the Linux kernel, the following vulnerability has been resolved: net: missing check virtio Two missing check in virtio_net_hdr_to_skb() allowed syzbot to crash kernels again 1. Affects linux versions 5.10.103-1 – 6.9.9-1. No fix is published. How to fix ↓
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Background
The Linux kernel is the core component of many operating systems, responsible for managing hardware resources and providing essential services to applications. It supports a wide range of functionalities, including networking, file systems, and process management. This vulnerability specifically affects the networking stack, where improper handling of certain data structures can lead to system crashes, impacting stability and security.
Vulnerability Detail
In the Linux kernel, a vulnerability was identified in the virtio_net_hdr_to_skb function, where two critical checks were missing. This oversight allowed syzbot to crash kernels repeatedly. The first issue arises when the skb_segment function is called, potentially leaving the buffer in a non-linear state without executing the __skb_linearize function. This results in a condition where the offset exceeds the skb_headlen, triggering a WARN_ON_ONCE warning in skb_checksum_help. The second issue involves the mathematical relationship between struct sk_buff and struct virtio_net_hdr members, where gso_size must be greater than needed, and remainder must also be greater than needed, leading to further warnings. The vulnerability can be exploited to crash the system, causing denial of service.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, users can limit the use of the affected networking features or disable certain network functionalities until the kernel is updated. However, this is not a permanent solution and should only be used until a proper fix is applied.
Conclusion
The CVE-2024-43817 vulnerability in the Linux kernel poses a significant risk due to missing checks in the virtio_net_hdr_to_skb function. Users are advised to update their systems promptly to mitigate potential crashes and ensure stability. Utilizing tools like Vulert can help monitor and alert for such vulnerabilities in real-time.
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FAQ
CVE-2024-43817 is a vulnerability in the Linux kernel related to missing checks in the virtio_net_hdr_to_skb function, which can lead to system crashes.
Exploitation of this vulnerability can result in denial of service, causing the system to crash and become unresponsive.
The vulnerability affects multiple versions of the Linux kernel across Debian 11, 12, and 13.
Yes, patches are available in the latest kernel updates. Users should upgrade to the fixed versions to mitigate the risk.
You can use Vulert, which monitors open-source vulnerabilities in real-time. By uploading your manifest file like package-lock.json, you can check for vulnerabilities without installation.
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